Valved bag and method of manufacturing it



Feb. 18,1947. 3, BELCHER 2,415,362

VALYED BAG AND METHOD OF MANUFACTURING IT 2 Sheets-Shet 2 Filed March17, 1944 PIC-3.8.

FIG]

Feb..l8, 1947. 'n. BELCHER VALVED BAG AND METHOD OF MANUFACTURING ITFiled March 17, 1944 2 SheetsShe et 1 04 Immu- I J 14%.. ,7

- claims. I

tensionlessbag showing the thereto;

I J Daniel Belcher,

Bemls Bro. Bag Com I I 2.415.852]v "vatvnn naej wil .v asslgnor to icorporation of m y I a plication rch yr, 1944, seria -52875 v Thisinvention relates to valved bags, and to a.

- method of manufacturingthem, and with regard to certain morespecificfeatures, to sift-proof ba valvesof the sleeve-lined, tucked-in flaptype.

The invention is an improvement upon the in- I 4 othermodification; and,

ventions disclosed and claimed in two United States patentapplications-namely; Serial No.

526,910, filed March 17, 1944, by William R. Wood, 'forvalvedbagsand'method of manufacturing them; and Serial No.'526',911, filedMarch 1'1, 1944,

' by Gus A.'Bauman, for valved bags and method of mahufacturing them. Itis also an improve'-; "ment upon the construction shown'in-United StatesPatent 1,827,040, dated October 13, 1931.

1 closed has, illustrating the final anaement oi the Fig. 6 species;

Fla. 9 is a plan viewoi Fla. 8, without the cover strip and itsstitching;

Among the several objects of the invention may I ,he noted the provisionof improved simple'm'eans of attaching a sleeve liner to a bag valve;the provision of attachment means of the class described whichiseffective whether or not the bag carrying the valve includes avalve-forming extensionbut particularly when it does-not; and theprovision of an attachment means ofthis class which may he efiect'ed atlow cost and high rates of pr'oducinlpart'pointed out hereinafter.

Elie invention accordingly comprises"theelements and combinationsofelements, steps. and sequence of steps, features of construction andmanipulation, and arrangements of parts which tion. Other objects willbe in part ohviousand will he exemplified in the structures and methodshereinafter described, and, the scope of .the application vofwhlch beindicated inthe following In the accompanying d m Wm 11 air? inustratedseveral'of variouspossible 'embodi-= merits of the invention,

Fig. '1 is a perspective View of a drawn-out, ex

invention applied These fold lines 25, 2V

generally used for later forming and turning in Fig. 2 is a verticalsection through a finished and closed has, embodying" the'constructionof Fig.1; i

I Fig. 3 iaa view similar to Fig. 1, showing a modifi'ed sleeveattachment;

' Fig. e is a viewsimilar to Fig. 2, but illustrating the mention; I Y 1his. 5 is a view similar to Fig. 1, showings ether modification;

his. 6 is a view similar-to Fig. fiyshowing another species of the Fig.5 modification;

Big. 7 13a. fragmentary view similar to the 'riaht=hand portion of Fig.6, illustrating a subsequent step in connection with the Fig. 6 species;

Fig. 8 is a vertical section of one corner of a 5 during the stretchingoperation. the above-mentioned side gussets is common and shown. ThisFig. 10 is'a view similar some. '6, showing an Fig. 11 is a'diagrammaticview of a sewing ma chine illustrating how an attachment is made,

using the Fig 1' form of the invention, for ex- I ample.

Similar reference characters indicate corre sponding parts throughout.the several views of the drawings. Y Y Y Referring now more-particularlyto Fig. 1, there is shownthe corner of an extensionless-gussetedbag l,which has been, stretched out-"in -the directionoi the arrows shown, soas to open out the upper end of one ofthe side gusset portions 5.

The mouth of such a bag is uniformly ina plane at right angles to thelength of the bag." The gussetjconsists of three longitudinal creases s,H and it, which'are formed when the tube isformed from which the hasmaterial is cut. The

creases 9 and it ultimately form the bag corners,

the shaded corners shown being only temporary forms the sublectmatterupon which the present invention is operative. outward extension fromthe mouth edge portion 3, but for various reasons it is more economicalto make bags lnquantitieswithout such exten-s sions.

Additional folds or creases- 25, 2? and it may he applied beforeattachment of the valve liner.

shown at ill-and to be described, or the applies-=- tion of thesecreases may bepostponed until said valve liner has been applied, aswillappear.

and 29 are; oi the type a valve nap, causing th material at the upperend of the gusset s to b eak along the proper lines for the purpose.

' At numeral-ll is shown a sleeve-forming in 'To apply this sert orliner of quadrilateral form. liner or insert, the operator, as abovestated, stretches out the gusseted corner of. the has: as makes thevadjacent part of the gusset substantially fiat. Against the marginaiportion of this fiat portion of the gusset is laid the marginal portionof the sleeve liner or insert i l. This causes the sides of the liner tointersect the mouth edge 3 at corner 2, these sides being at rightangles to the mouth edge 3. The oper ator then places the assembly overthe horn i a A bag havin Often, sucha bag has an 'shown in Fig. 1.

- is improved.

- tension I4.

atlases of a sewing machine (Fig. 11), and applies stitching 23 in acurved path, starting at one corner or intersection 2 and ending at theother corner or intersection I. The result is the attachment The wholeoperation is quite simple, since the four fingers of the operator may beinserted behind the corner portions 2 and 4, and the thumbs may holdsaid corners bag. The non-linear character oi is an important feature oithe invention. allows for dispensing with the extensionabove-mentione'd, which would be required in order to stitch straightacross the insert. By arcuately sewing as described, the sewing machineneedle may start in the clear and advance relatively across the edge ofthe bag at the comer or intersection 2, finally advancing into the clearby traverse across the edge at the comer or intersection pletion of thestitching operation may occur at than at points within material. Thelatter would nipulation for starting and stopping the seam.

After the sleeve liner has been applied as indicated in Fig. l, a valveflap 3! may be formed of the upper end of the gusset by breaking along.

the crease lines 25, 21 and 29. This is indicated in cross section Fig.2, is shown as extending outward from the valve flap thus formed. Itbecomes bent at i2 next to crease l l. The result is a lined valve flapin an extensionless bag wherein the fit of the liner Finally, the bag isclosed, along with the upper side of the valve by applying an invertedV-shaped cover strip 45 held in place by means of stitching 41. The bagis then ready for the insertion into the valve of a suitable fillernozzle, by means of which it may be filled. After withdrawal of thenozzle, the outer portions of the sleeve i! may be wedded into the valvenap by pushing the outside portions in the direction of the curved arrowshown in Fig. 2. To facilitate this the liner is made or flexiblematerial such as crinkled or crepe paper. A closed condition of a valveis not shown.

In Figs. 3 and 4, like numerals designate like In this case, however,the sleeve liner is indexed B, and differs from the Fig. 1 iorm in thatit incorporates a beveled extension l having slits 8 providing flexibletongues it. As in Fig. 1, ther is no extension formed from the materialof the bag per se. In this case, stitching 23 is applied arcuately, asbefore from intersection or corner 2 to intersection or corner 6. Theresult is attachment of the sleeve liner to the valve flap at anintermediate region of said liner. Then, when the valve flap is turnedin, as indicated in Fig. 4, there will be an inward extension havingflexible tongues, and an outward ex- The bag and the lined valve arethen closed by means of the stitching 41. After filling and closure,outer extension it may be wedded into the valve. The flexible inwardextension"! will tend to move into sealing position within the valve inresponse to any tendency for the materials therein to escape.

In Fig. is illustrated the point that, although the invention isprimarily for use with sleeve liners used in connection withextensionlessbags, it may also be used in connection with bags havingextensions. In Fig. 5 the usual-flap extension is shown at 15. Otherwisethe numerals correspond to those used in Fig. 1. In thiscase.

c. Thus starting and comwherein the sleeve liner i1 cover tape 55 andalthough a straight sewn seam could be used, the arcuate seam or itsequivalent has advantages. any seam shape which is not a single straightline across the 5 valve. That is, it has a component of seam traversewhich is along the ultimate axis of the valve the valve axially at itscentral portion without stifiening either the or outward extensionstherefrom.

- In Figs. 6, '7 and 8 is shown an application of the invention to a baghaving an extension it, but wherein the sleeve liner attachment 5| isreversed in its placement with respect to that shown in Fig. 5. Thestitching 23 is applied as before, and then the attachment Si is foldeddown along the line 53, as indicated in Fig. '7. Thereafter, uponforming the valve flap, the result shown in Fig.- 8 is obtained, whereinthe flap is again indexed with numeral 31, the closure strip. beingshown at 45 held in place by the stitching d1.

It will be clear from Fig. 9 how the stitching has the above-mentioneddirectional component along the axis of the valve flap. It will berecalled that Fig. 9 is a plan view of a bag valve without the coverinverted, turned-down sleeve liner 5! is that the stitching 23 isguarded thereby against abrasion.

In Fig. ill-is shown the-attachment or an inverted liner attachment(similar to that shown in Fig. 6) to a bag having no extension itself.Such a bag corresponds to those shown in Figs l-4. Prior to tucking inthe valve flap in the cas of Fi 10, the attachment is turned down, asabove described in connection with Figs. 6

and 7.

Although I have illustrated 'a fairly constant curvature for the arewhich comprises the locus of the stitching 23, it should be understoodthat the curvature may vary from beginning to end of this stitching, andalso that the locus may even be composed of angularly relatedstraightline portions, preferably arranged concave upwardly with respectto or stated otherwise convex toward the opposite closed end of the bag.The this connection is that the stitching should first be run from oneside of the liner attachment where it intersects the bag mouth towardthe opposite end of the bag, and then away from it, while at the sametime traversing the attachment from side to side, and finallyapproaching lar to the valve length. This is clear from Figs.

2, 4, 8 and 9.

While angular or curved lines of stitching are equally effective, so faras attachment characteristics are concerned, the arcuate iormis somewhateasier to apply, since the sewing machine operator may continuouslyadvance and turn the bag which is somewhat easier to do than to run astraight line of stitchingandthen making an angular ofiset for asubsequent line of stitching. In the case of a bag with an extension adownwardly concave form couldalso be applied but this is not asconvenient, and in any event it could not be used practically in theextensionless forms of Figs. 1, 3 and 10.

A general advantage of sewing the liner attach-' flap-forming parts ofthe valve is the stitchstrip 45. An advantage of the the mouth of thebag, I

primary point in.

ing not only holds the liner attachment to the bag, but also serves tohold together the multiply layers of the bag to prevent siftingtherebetween of material carried in; the bag.

An advantage of the invention is that in addition to making easier amanual application of the sleeve liner, it also makes practicable thedevising of automatic machinery for so doing.

In view of the above, it will be seen that the several objects of theinvention are achieved and other advantageous results attained- As manychanges could be made in the above 1 having a mouth edge lying uniformlyin a plane at right angles to the length of a bag formed ,from the tube,comprising stretching out said attachment to a valve-forming portion ofa; tube valve' forming portion adjacent the open month edge of the tube,laying said attachment against constructions without departing from thescope of the invention, it is intended that all matter con-' tained inthe above description or shown in the accompanying drawings shall beinterpreted as illustrative and not in a limiting sense.

1 claim: I n

1. In a valved bag, tucked-in valve flap extending inwardly into themouth ofthe bag, said flap being formed from a'portion of said mouth,said mouth prior to the tucking-in of the flaplying uniformly in a planeat right angles to the length oi the bag, said flap being fo'rmedbyfolding in wardly a portion of the adjacent bag wall, a sleeve liner insaid valve flap having a portion arcuately stitched to the inwardlyextending wall the stitching prior to turning in the flap lyingsubstantially in the plane of the bag mouth where intersected by thesides of the sleeve liner, andinwardly afterthe arc of stitching beingconcave the flap is turned in.

- portions of said-valve flap, the terminal points of 2. The method ofapplying a sleeve-forming said stretched-out valve-forming portion withthe sides or the attachment extending from andlying at right angles tosaid mouth edge, and applying a line of connecting stitching through theattachment. and the valve-forming portion so that the locus of thestitching is convex said mouth edge of the tube, the ends of sconnecting stitching lying at the intersection of attachment.

said mouth edge and the 3 essences cram Thefollowing references are-ofrecord in the file of this. patent:

p "t Number- Name -Date 907.557 'Bates Dec. 22, race 1,852,026'Redington Apr. 5, 1932- 1,783,624 Menke et al Dec. 2, 1930 2,275,505Crawford et al-.--.. Mar. 10, 1942 1,993,377 McNulty\ Mar. 5, 19352,148,648 Rose Feb. 28, 1939 I FoR IGNPA Number Country Date 358,454British Apr. 4, 1930 307,483

British Mar. 11, 1930 L y Certificate of Correction Patent No.2,415,862. February 18, 1947. DANIEL BELOHER It is hereby certified thaterror appears in the printed specification of the above numbered patentrequiring correction as follows: Column 5, line 19, claim 1, beforetucked-in insert the article a; and that the said Letters Patent shouldbe read with this correction therein that the same may conform to therecord of the case in the Patent Office.

Signed and sealed this 2nd day of September, A. D. 1947.

LESLIE FRAZER,

F ii'st Assistant Commissioner of Patents.

